/* Parallax public sites: reading stylesheet. System fonts only; no external requests. */

:root {
  color-scheme: light dark;
  --background: #f8f7f2;
  --surface: #ffffff;
  --text: #1d2830;
  --muted: #56636d;
  --accent: #0b5f78;
  --border: #d8ddd9;
  --tint: #f1f3f1;
  --badge-bg: #e8eff1;
  --badge-text: #0a4a5e;
  --focus: #b3470c;
  --serif: ui-serif, Georgia, Cambria, "Times New Roman", serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --measure: 42rem;
  --wide: 64rem;
  --header-offset: 1.5rem;
  font-family: var(--serif);
  font-size: 100%;
  line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #11181d;
    --surface: #182126;
    --text: #eef2f3;
    --muted: #b2c0c7;
    --accent: #79c9e3;
    --border: #39474e;
    --tint: #1f2a30;
    --badge-bg: #20333b;
    --badge-text: #bfe6f2;
    --focus: #f3a55f;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  background: var(--background);
  color: var(--text);
  font-size: 1.0625rem;
  margin: 0;
}

/* Links and focus */

a {
  color: var(--accent);
  text-decoration-thickness: 0.06em;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 0.14em;
}

:focus-visible {
  border-radius: 2px;
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  background: var(--surface);
  color: var(--accent);
  font-family: var(--sans);
  left: 0.75rem;
  padding: 0.5rem 0.9rem;
  position: absolute;
  top: -10rem;
  z-index: 10;
}

.skip-link:focus {
  top: 0.75rem;
}

/* Header, navigation, footer */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  font-family: var(--sans);
}

.header-inner,
footer {
  margin-inline: auto;
  max-width: 64rem;
  padding: 0.75rem clamp(1rem, 4vw, 2.5rem);
}

.header-inner {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
}

.site-title {
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.005em;
  text-decoration: none;
}

.edition-label {
  background: var(--badge-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--badge-text);
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.4;
  padding: 0.1rem 0.6rem;
  white-space: nowrap;
}

nav {
  display: flex;
  flex-basis: 100%;
  flex-wrap: wrap;
  font-family: var(--sans);
  font-size: 0.92rem;
  gap: 0.15rem 1.1rem;
}

nav a {
  display: inline-block;
  padding-block: 0.3rem;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

@media (min-width: 48rem) {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 5;
  }

  :root {
    --header-offset: 6.5rem;
  }

  body {
    font-size: 1.125rem;
  }

  nav {
    flex-basis: auto;
    margin-left: auto;
  }
}

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.88rem;
  margin-block: 2rem 1.5rem;
}

footer p {
  margin: 0.35rem 0;
}

/* Reading column */

main {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin: clamp(0rem, 3vw, 2rem) auto 0;
  max-width: var(--wide);
  min-height: 60vh;
  overflow-wrap: break-word;
  padding: clamp(1.25rem, 5vw, 3.25rem) clamp(1rem, 6vw, 4rem) clamp(2rem, 6vw, 4rem);
}

@media (max-width: 40rem) {
  main {
    border-inline: 0;
    border-radius: 0;
  }
}

main > :first-child {
  margin-top: 0;
}

/* Text keeps a readable line length; tables and code blocks use the full panel. */
main > :not(table, pre, div.sourceCode) {
  margin-inline: auto;
  max-width: var(--measure);
}

p,
ul,
ol,
dl,
blockquote,
pre {
  margin-block: 0 1.1em;
}

ul,
ol {
  padding-left: 1.4em;
}

li {
  margin-block: 0.3em;
}

li > p {
  margin-block: 0.3em;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--text);
  font-family: var(--serif);
  line-height: 1.25;
  margin-block: 1.8em 0.6em;
  scroll-margin-top: var(--header-offset);
  text-wrap: balance;
}

h1 {
  font-size: clamp(1.75rem, 1.3rem + 2vw, 2.35rem);
  letter-spacing: -0.005em;
  margin-bottom: 0.4em;
}

h2 {
  border-top: 1px solid var(--border);
  font-size: 1.4rem;
  padding-top: 1rem;
}

h3 {
  font-size: 1.17rem;
}

h4,
h5,
h6 {
  font-size: 1rem;
}

/* Metadata line under the title ("Edition label:", "Parent topic:") */
main > h1 + p {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.9rem;
}

/* Definition-style labels: "Definition:", "Status:", dated timeline entries */
main p > strong:first-child {
  font-family: var(--sans);
  font-size: 0.94em;
  letter-spacing: 0.01em;
}

hr + h2 {
  border-top: 0;
  padding-top: 0;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

blockquote {
  background: var(--tint);
  border-left: 3px solid var(--accent);
  margin-inline: 0;
  padding: 0.8rem 1.1rem;
}

blockquote > :last-child {
  margin-bottom: 0;
}

.area-banner {
  background: var(--tint);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  font-family: var(--sans);
  font-size: 0.92rem;
  margin-bottom: 1.5rem;
  padding: 0.8rem 1.1rem;
}

code,
pre,
kbd,
samp {
  font-family: var(--mono);
  font-size: 0.88em;
}

pre {
  background: var(--tint);
  border: 1px solid var(--border);
  max-width: 100%;
  overflow-x: auto;
  padding: 0.8rem 1rem;
}

/* "Not published in this edition" references */
.link-unavailable {
  color: var(--muted);
  cursor: help;
  text-decoration: underline dotted 1px;
  text-underline-offset: 0.2em;
}

/* Tables */

table {
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.9rem;
  margin-block: 0 1.4em;
  max-width: 100%;
}

caption {
  color: var(--muted);
  padding-bottom: 0.4rem;
  text-align: left;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.45rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

th,
thead td {
  background: var(--tint);
}

@media (max-width: 48rem) {
  table {
    display: block;
    overflow-x: auto;
  }

  table col {
    width: auto !important;
  }
}

/* Source References, Sources and Related sections */

#source-references + ul,
#sources + ul {
  font-size: 0.94rem;
  list-style: none;
  padding-left: 0;
}

#source-references + ul > li,
#sources + ul > li {
  margin-block: 0 0.75em;
  padding-left: 1.5em;
  text-indent: -1.5em;
}

h2[id^="related"] + ul {
  column-gap: 2rem;
  columns: 2 13rem;
  font-size: 0.97rem;
}

h2[id^="related"] + ul > li {
  break-inside: avoid;
  margin-block: 0 0.35em;
}

/* Pandoc footnotes */

.footnote-ref {
  scroll-margin-top: var(--header-offset);
  text-decoration: none;
}

.footnote-ref sup {
  font-family: var(--sans);
  font-size: 0.72em;
  font-weight: 600;
  line-height: 0;
  padding-inline: 0.1em;
}

.footnotes {
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  margin-top: 2.5rem;
  padding-top: 0.75rem;
}

.footnotes > hr {
  display: none;
}

.footnotes::before {
  color: var(--muted);
  content: "Notes";
  display: block;
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.footnotes ol {
  padding-left: 1.8em;
}

.footnotes li {
  scroll-margin-top: var(--header-offset);
}

.footnotes li::marker {
  color: var(--muted);
  font-family: var(--sans);
  font-weight: 600;
}

.footnotes li:target,
.footnote-ref:target {
  background: var(--badge-bg);
  outline: 1px solid var(--border);
}

.footnote-back {
  display: inline-block;
  font-family: var(--sans);
  margin-left: 0.3em;
  padding-inline: 0.25em;
  text-decoration: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    scroll-behavior: auto !important;
    transition: none !important;
  }
}

/* Print */

@media print {
  :root {
    --background: #fff;
    --surface: #fff;
    --text: #000;
    --muted: #333;
    --accent: #000;
    --border: #999;
    --tint: #fff;
    --badge-bg: #fff;
    --badge-text: #000;
    color-scheme: light;
    font-size: 11pt;
  }

  body {
    font-size: 11pt;
  }

  nav,
  .skip-link {
    display: none;
  }

  .site-header {
    border-bottom: 1px solid #999;
    position: static;
  }

  main {
    border: 0;
    margin: 0;
    max-width: none;
    padding: 0;
  }

  main > :not(table, pre, div.sourceCode) {
    max-width: none;
  }

  a {
    text-decoration: none;
  }

  main a[href^="http"]::after {
    content: " <" attr(href) ">";
    font-family: var(--mono);
    font-size: 0.8em;
    overflow-wrap: anywhere;
  }

  .footnote-back {
    display: none;
  }

  h1,
  h2,
  h3 {
    break-after: avoid;
  }

  blockquote,
  pre,
  tr,
  .footnotes li {
    break-inside: avoid;
  }

  h2[id^="related"] + ul {
    columns: auto;
  }

  table {
    display: table;
  }

  footer {
    border-top: 1px solid #999;
  }
}